A continuous casting tundish facilitating material taking

Abstract

The application discloses a continuous casting tundish facilitating material taking, which comprises a tundish body, a material taking groove arranged on one side of the tundish body, the material taking groove being communicated with the tundish body, and the bottom surface of the material taking groove being a slope, and the side of the bottom surface of the material taking groove far from the tundish body being higher than the side of the bottom surface of the material taking groove close to the tundish body. The groove body of the material taking groove is communicated with the groove body of the tundish body. When liquid steel flows into the tundish body, the liquid steel enters the material taking groove when the liquid level height exceeds the bottom of the material taking groove. An operator can collect the liquid steel by using a sampler, and analyze the cooled sample (such as spectral analysis) to determine the chemical composition. The bottom wall of the material taking groove is a slope, and is inclined to the groove of the tundish body, so that when the liquid steel level drops, the liquid steel in the material taking groove flows into the tundish body, and the residual liquid steel in the material taking groove is prevented.

Description

Technical Field

[0001] This application relates to the field of metallurgical technology, and in particular to a continuous casting tundish that facilitates material handling. Background Technology

[0002] The tundish is a crucial container in continuous casting of steel, located between the ladle and the crystallizer. It acts as a central hub for the distribution, buffering, stabilization, and purification of molten steel. The continuous casting process can be simplified as: steelmaking furnace → ladle → tundish → crystallizer → secondary cooling zone → casting of the billet. Thus, the tundish serves as a transfer structure between the large-volume ladle and the crystallizer. For multi-strand continuous casting machines, the tundish smoothly distributes the molten steel injected from the ladle into multiple crystallizers and provides a buffer surface for the flowing molten steel, creating conditions for the formation of a stable billet shell within the crystallizer. Simultaneously, the tundish plays a vital role in quality control: non-metallic inclusions in the molten steel can severely impair the mechanical properties of the steel (such as fatigue strength and toughness). During continuous casting, the tundish removes impurities by promoting their flotation and by setting up barriers and dams, making it crucial in the continuous casting process.

[0003] The existing tundish has neat edges, making it difficult for operators to directly access the tundish with sampling devices to take samples. Consequently, it is impossible to analyze the composition and structure of the molten steel inside the tundish, determine whether the crystallization casting process is stable, or whether the structure of the cast molten steel has changed during the process. Utility Model Content

[0004] This invention proposes a continuous casting tundish that facilitates material handling, allowing operators to collect molten steel samples from the tundish for analysis.

[0005] This utility model is achieved through the following technical solution:

[0006] A continuous casting tundish for easy material handling includes: a tundish body and a material handling chute disposed on one side of the tundish body, the material handling chute being connected to the tundish body, the bottom surface of the material handling chute being inclined, and the side of the bottom surface of the material handling chute away from the tundish body being higher than the side of the bottom surface of the material handling chute closer to the tundish body; the tundish body includes: a molten steel receiving zone and a large cavity zone, molten steel being injected into the tundish body through the molten steel receiving zone and flowing into the large cavity zone; the large cavity zone is connected to the material handling chute.

[0007] Furthermore, multiple water inlets are provided within the large cavity area, through which molten steel flows out of the tundish body.

[0008] Furthermore, the intermediate tundish body includes a seat brick, which is installed on the bottom surface of the intermediate tundish body and fitted onto the sprue.

[0009] Furthermore, the tundish body includes: a slag-blocking weir disposed between the large cavity area and the molten steel receiving area, the slag-blocking weir being provided with multiple flow-guiding planes and flow-guiding holes located on the flow-guiding planes, the axis of the flow-guiding holes being perpendicular to the flow-guiding planes; molten steel flows from the molten steel receiving area into the large cavity area through the flow-guiding holes.

[0010] Furthermore, an impact plate is installed in the molten steel receiving zone, the impact plate is located on the bottom surface of the molten steel receiving zone, and the upper surface of the impact plate is a plane or a concave spherical cap surface.

[0011] Furthermore, the intermediate package body includes: an outer steel wall, a permanent layer located within the outer steel wall, and a working layer located on the inner wall of the permanent layer.

[0012] Furthermore, the intermediate bag body is equipped with a plurality of trunnions and lifting shafts; the trunnions and the lifting shafts are installed in perpendicular directions to each other; the intermediate bag body is mounted on the intermediate tank car via the trunnions; and an external lifting device lifts the intermediate bag body via the lifting shafts.

[0013] The beneficial effects of this utility model are as follows:

[0014] The sump is connected to the tundish body. When molten steel flows into the tundish, and the liquid level exceeds the bottom of the sump, the molten steel enters the sump. Operators can collect the molten steel using a sampler and analyze the cooled sample (e.g., using spectral analysis) to determine its chemical composition. The bottom wall of the sump is sloped towards the tundish body, causing the molten steel in the sump to flow into the tundish body as the liquid level drops, preventing residual molten steel in the sump. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0017] Figure 2 yes Figure 1 A three-dimensional structural diagram from another angle;

[0018] Figure 3 This is a cross-sectional schematic diagram of the present invention;

[0019] Figure 4 This is a three-dimensional structural diagram of the slag-blocking weir in this utility model;

[0020] Figure 5 This is a structural schematic diagram of one embodiment of the impact plate in this utility model;

[0021] Figure 6 This is a schematic diagram of another embodiment of the impact plate in this utility model.

[0022] in:

[0023] 1. Tundish body; 11. Steel receiving area; 12. Large cavity area; 13. Sprue; 14. Slag weir; 15. Guide hole; 16. Sealing brick; 17. Impact plate; 2. Feed chute; 3. Outer steel wall; 4. Permanent layer; 5. Working layer; 6. Trunnion; 7. Lifting shaft. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] Please refer to Figures 1 to 3 This application discloses a continuous casting tundish that facilitates material handling, comprising: a tundish body 1 and a material handling trough 2 disposed on one side of the tundish body 1, the material handling trough 2 being connected to the tundish body 1, the bottom surface of the material handling trough 2 being an inclined surface, and the side of the bottom surface of the material handling trough 2 away from the tundish body 1 being higher than the side of the bottom surface of the material handling trough 2 closer to the tundish body 1.

[0028] The tundish body 1 is a thick-walled shell used to hold the molten steel flowing from the ladle. One side wall of the tundish body 1 extends outward to form a sampling trough 2. The trough 2 is connected to the trough of the tundish body 1. When the molten steel flows into the tundish body 1, and the liquid level exceeds the bottom of the sampling trough 2, the molten steel enters the sampling trough 2. Operators can collect the molten steel using a sampler and analyze the cooled sample (e.g., spectral analysis) to determine its chemical composition. The bottom wall of the sampling trough 2 is sloped towards the tundish body 1, so that when the molten steel level drops, the molten steel in the sampling trough 2 flows into the tundish body 1, preventing molten steel from remaining in the sampling trough 2.

[0029] Please refer to Figure 1 , Figure 2 and Figure 3 The tundish body 1 includes a molten steel receiving area 11 and a large cavity area 12. Molten steel is injected into the tundish body 1 through the molten steel receiving area 11 and flows into the large cavity area 12. The large cavity area 12 is connected to the material receiving trough 2. Multiple water inlets 13 are provided in the large cavity area 12. Molten steel flows out of the tundish body 1 through the water inlets 13.

[0030] The molten steel receiving zone 11 is the molten steel injection zone. The tundish body 1 of this application is a T-shaped tundish. After molten steel is injected, the molten steel receiving zone 11 receives the impact of the molten steel, therefore the wall of the molten steel receiving zone 11 is thicker than the wall of the large cavity zone 12. The molten steel receiving zone 11 is responsible for holding the molten steel and diverting it into the large cavity zone 12. Multiple nozzles 13 are provided in the large cavity zone 12, meaning the tundish body 1 of this application is a multi-flow tundish. Please refer to... Figures 1 to 4 Molten steel flows evenly into each of the slag weirs (pouring ports) of the large cavity 12 through the slag-blocking weir 14 between the large cavity 12 and the molten steel receiving zone 11.

[0031] The slag-blocking weir 14 is provided with multiple guiding planes and guiding holes 15 located on the guiding planes, the axis of the guiding holes 15 being perpendicular to the guiding planes; molten steel flows from the molten steel receiving area 11 into the large cavity area 12 through the guiding holes 15. After the installation of the slag-blocking weir 14 is completed, a water model test needs to be performed on the tundish body 1 to simulate the liquid flow direction and verify the safety of the tundish body 1: through geometric and dynamic similarity fluid simulation experiments, the flow of molten steel in the tundish body 1 is simulated, and design defects of the tundish body 1 are discovered in a low-cost and low-risk manner. Simulation experiments are conducted to check whether the fluid is evenly distributed in the large cavity area 12, whether it is stagnant in the feed trough 2, whether there are casting defects, etc., and to reduce molten steel eddies.

[0032] The slag-blocking weir 14 is not a single planar structure. Instead, it is composed of multiple planes with obtuse angles between adjacent planes. Each plane has several guide holes 15, which are cylindrical holes with their axes perpendicular to the plane in which they are located. These guide holes are used to evenly distribute molten steel within the large cavity area 12.

[0033] The slag weir 14 is specifically a fire-resistant partition wall used to change the flow field of molten steel into the large cavity zone 12 and to uniformly measure the temperature and composition of the molten steel in the large cavity zone 12. At the same time, the slag weir 14 can prevent inclusions and slag particles in the molten steel in the molten steel receiving zone 11 from flowing into the large cavity zone 12, thereby reducing impurities in the molten steel during the subsequent crystallization process.

[0034] Please refer to Figure 3 , Figure 5 and Figure 6 As mentioned above, the molten steel receiving zone 11 is the molten steel impact zone: when molten steel flows into the molten steel receiving zone 11 from the ladle, due to the spatial drop, the molten steel will impact the bottom surface of the molten steel receiving zone 11. Therefore, molten steel penetration accidents of the tundish body 1 often occur in the molten steel receiving zone 11. To prevent molten steel penetration, an impact plate 17 is installed on the bottom wall of the molten steel receiving zone 11. The impact plate 17 is made of high-temperature and corrosion-resistant material, such as high-alumina material. The upper surface of the impact plate 17 is a flat surface or a concave spherical crown surface to buffer the impact force of the molten steel.

[0035] The tundish body 1 includes a seat brick 16, which is installed on the bottom surface of the tundish body 1 and fitted onto the nozzle 13. The seat brick 16 is used to protect the nozzle 13, through which molten steel flows into the lower crystallizer.

[0036] Please refer to Figure 3 The intermediate ladle body 1 includes: an outer steel wall 3, a permanent layer 4 located within the outer steel wall 3, and a working layer 5 located on the inner wall of the permanent layer 4. The outer steel wall 3 is a welded steel plate structure. After the steel plates are welded, a box frame structure is additionally welded around the outer perimeter of the steel plates, and additional stiffening plates are added to increase the strength of the outer steel wall 3. After welding, the welded parts need to be inspected for flaws to complete safety verification. The permanent layer 4 is made of either acidic or alkaline materials, serving to resist fire and seal the outer steel wall 3, preventing molten steel from contacting the outer steel wall 3 and penetrating the ladle. Acidic materials include siliceous materials; alkaline materials are mostly magnesium materials, used to solidify components such as insulation boards, slag weirs 14, and seat bricks 16 at the nozzle 13. The thickness of the permanent layer 4 is generally 140mm to 200mm. The working layer 5 is the layer that comes into contact with molten steel, with a thickness of 40mm to 80mm. The material of the working layer 5 is the same as that of the permanent layer 4. The layer delaminates because the working layer 5 will gradually be corroded and become thinner during the contact with molten steel. When the working layer 5 is worn down to a certain extent, it needs to be taken off the production line and rebuilt. The time from the start of use of the working layer 5 to its complete consumption is the service life of the tundish body 1.

[0037] Please refer to Figures 1 to 3 The tundish body 1 is equipped with several trunnions 6 and lifting shafts 7; the trunnions 6 and the lifting shafts 7 are installed perpendicular to each other; the tundish body 1 is mounted on the intermediate ladle car via the trunnions 6; an external lifting device lifts the tundish body 1 via the lifting shafts 7. The lifting device for the tundish body 1 is a special tool, generally an I-beam type, whose function is to move the tundish body 1 for installation, maintenance, and replacement. The lifting device and the lifting shafts 7 cooperate to achieve the purpose of moving the tundish body 1. The trunnions 6 are used to mount the tundish body 1 on the intermediate ladle car, which is a special vehicle used to support and transport the intermediate ladle. It has the functions of traveling, lifting, and lateral fine adjustment. Its function is to adjust the position of the tundish body 1, and to perform the following direct or indirect control functions: carrying and transporting, accurately positioning the tundish body 1 and the crystallizer, starting and stopping the flow of molten steel into the crystallizer, emergency cutting off of steel flow, and controlling the flow of steel. The structure of the intermediate tanker and its specific operation method can be implemented by those skilled in the art using existing technology, and will only be briefly described here without going into details.

[0038] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A continuous casting tundish that facilitates material handling, characterized in that, include: The tundish includes a tundish body and a material receiving trough disposed on one side of the tundish body. The material receiving trough is connected to the tundish body and has a sloping bottom surface. The side of the bottom surface of the material receiving trough away from the tundish body is higher than the side of the bottom surface of the material receiving trough closer to the tundish body. The tundish body includes a molten steel receiving area and a large cavity area. Molten steel is injected into the tundish body through the molten steel receiving area and flows into the large cavity area. The large cavity area is connected to the material receiving trough.

2. The continuous casting tundish for easy material handling according to claim 1, characterized in that, Multiple water inlets are provided in the large cavity area, through which molten steel flows out of the tundish body.

3. The continuous casting tundish for easy material handling according to claim 2, characterized in that, The intermediate tundish body includes a seat brick, which is installed on the bottom surface of the intermediate tundish body and fitted onto the sprue.

4. The continuous casting tundish for easy material handling according to claim 1, characterized in that, The tundish body includes: a slag-blocking weir disposed between the large cavity area and the molten steel receiving area, the slag-blocking weir being provided with multiple flow-guiding planes and flow-guiding holes located on the flow-guiding planes, the axis of the flow-guiding holes being perpendicular to the flow-guiding planes; molten steel flows from the molten steel receiving area into the large cavity area through the flow-guiding holes.

5. The continuous casting tundish for easy material handling according to claim 1, characterized in that, An impact plate is installed in the molten steel receiving zone. The impact plate is located on the bottom surface of the molten steel receiving zone, and the upper surface of the impact plate is a plane or a concave spherical cap surface.

6. The continuous casting tundish for easy material handling according to claim 1, characterized in that, The intermediate package body includes: an outer steel wall, a permanent layer located within the outer steel wall, and a working layer located on the inner wall of the permanent layer.

7. The continuous casting tundish for easy material handling according to claim 1, characterized in that, The intermediate bag body is equipped with several trunnions and lifting shafts; the trunnions and lifting shafts are installed perpendicular to each other; the intermediate bag body is mounted on the intermediate tank car via the trunnions; an external lifting device lifts the intermediate bag body via the lifting shafts.

Images